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Polypropylene resin foamed beads and foam moldings

A foam molding, polypropylene-based technology, applied in the field of foam molding, can solve the problems of aging time increase, foam molding shrinkage, surface deterioration, etc., to achieve excellent dimensional stability and good melt adhesion , excellent surface effect

Active Publication Date: 2010-09-15
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally, this aging generally takes more than 10 hours, and requires a huge aging space and energy costs, so there are serious problems in terms of productivity
In addition, when the deformation of the foamed molded body that occurs immediately after molding is eliminated by the aging process, the fusion-adhesive surface of the foamed particles will also be opened, the particle gap will increase, the tortoise shell pattern will become obvious, and fine wrinkles will occur. The problem
In this way, for the foamed molded article utilizing expanded particles of a polypropylene resin, shrinkage, deformation, or Deterioration of the surface, or the problem of increased aging time

Method used

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  • Polypropylene resin foamed beads and foam moldings
  • Polypropylene resin foamed beads and foam moldings
  • Polypropylene resin foamed beads and foam moldings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] As the polypropylene resin, an ethylene-propylene random copolymer (K1) having a melting point of 141.5° C. described in Table 1 was used. After dry blending the resin with 0.1 parts by weight of talc as a bubble nucleating agent, Melt-kneading was performed in an extruder (manufactured by Osaka Seiki Works Co., Ltd., model 20VSE-50-28). The melted and kneaded resin was extruded into strips from a circular die with a diameter of 2 mm, then water-cooled, and then cut with a pelletizer to obtain a polypropylene-based resin with a weight of 1.2 mg per pellet. particle.

[0099] 100 parts by weight of the obtained polypropylene-based resin particles, 300 parts by weight of water, 2 parts by weight of calcium phosphate (manufactured by Taiping Chemical Industry Co., Ltd.) as a dispersant, and 0.04 parts by weight of sodium alkylsulfonate as a dispersing aid were charged to capacity. Into a 4.5 L pressure-resistant autoclave, 28 parts by weight of isobutane was added as a bl...

Embodiment 2

[0102] A foamed molded article was obtained in the same manner as in Example 1, except that the air pressure in the expanded polypropylene resin particles (K1B1) was set to 0.18 MPa when thermoforming the expanded polypropylene resin particles (K1B1). The evaluation results are shown in Table 3.

Embodiment 3

[0104] Except for using the following ethylene-propylene random copolymer (K2) as the polypropylene-based resin, polypropylene-based resin expanded particles (K2B1) and its expanded molded product were obtained in the same manner as in Example 2. The ethylene-propylene random copolymer (K2) used is obtained by using 5 parts by weight of an ethylene-propylene copolymer oligomer (Mv= 10000) and the obtained resin has a melting point of 141.5°C. The evaluation results are shown in Table 3.

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Abstract

Foam moldings obtained by packing polypropylene resin foamed beads into a mold and molding the beads by heating with steam, which exhibit little deformation even when the aging time for recovering the shrinkage and deformation after molding is short and which has a small shrinkage factor based on mold dimension and excellent dimensional stability and surface appearance; and polypropylene resin foamed beads which are obtained by expanding a polypropylene resin having a melting point of 125 to 160 DEG C and have a true expansion ratio of 20 to 35, characterized by exhibiting a melt viscosity of7500 to 12000 poises and a melt tension of 0.5 to 1.8g at 170 DEG C and having cell diameters of 200 to 1000[mu]m.

Description

technical field [0001] The present invention relates to a kind of polypropylene resin expanded particle. More specifically, the present invention relates to polyolefin-based expanded particles that can be used to manufacture polypropylene-based resin foamed molded articles, and expanded molded articles made of the polyolefin-based expanded particles. The polypropylene-based resin foamed The formed body can be used for cushioning packaging materials, containers (circulars), heat insulation materials, automotive bumper core materials, etc. Background technique [0002] The foamed molded article obtained by filling expanded polypropylene resin particles into a mold and thermoforming with water vapor has the advantages of a foamed molded article such as arbitrary shape, light weight, and heat insulation. And, if compared with the expanded molded article that also uses synthetic resin expanded particles, the expanded molded article obtained using expanded polypropylene resin par...

Claims

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Application Information

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IPC IPC(8): C08J9/18C08J9/232
CPCC08J9/232C08J2323/12
Inventor 广瀬文信千田健一落越忍常石浩司中山清敬
Owner KANEKA CORP
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